اعتبار،چابکی،پاسخگویی

به دست آوردن ضرایب تبدیل نمونه های استاندارد مکعبی بتن الیافی به نمونه ی استاندارد استوانه ای بتن الیافی

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه مهندسی عمران، دانشکده فنی مهندسی، دانشگاه آزاد اسلامی الیگودرز، الیگودرز، ایران

چکیده
خرابی و انهدام بتن به شدت به تشکیل ترک ها و ریز ترک ها بستگی دارد. با افزایش بارگذاری، ریز ترک ها به هم متصل شده و ترک ها را تشکیل می دهند. به ‌منظور رفع این مشکل و همچنین ایجاد شرایط همگن، در چند دهه اخیر از یک سری رشته های نازک که در تمام حجم بتن گسترده شده است، استفاده می گردد که به آن ها الیاف گفته می شود. ﺑﺘﻦ الیافی در حقیقت ﻧﻮﻋﯽ ﮐﺎﻣﭙﻮزﻳﺖ اﺳﺖ ﮐﻪ ﺑﺎ ﺑﮑﺎرگیری الیاف ﺗﻘﻮﻳﺖ ﮐﻨﻨﺪه داﺧﻞ ﻣﺨﻠﻮط ﺑﺘﻦ، ﻣﻘﺎوﻣﺖ ﮐﺸﺸﯽ آن ﻓﻮق اﻟﻌﺎده اﻓﺰاﻳﺶ ﻣﯽ ﻳﺎﺑﺪ. اﻳﻦ ﺗﺮکیب ﮐﺎﻣﭙﻮزﻳﺘﯽ، ﻳﮑﭙﺎرﭼﮕﯽ و پیوﺳﺘﮕﯽ ﻣﻨﺎﺳﺒﯽ داﺷﺘﻪ و اﻣﮑﺎن اﺳﺘﻔﺎده از ﺑﺘﻦ ﺑﻪ ﻋﻨﻮان ﻳﮏ ﻣﺎده ﺷﮑﻞ ﭘﺬﻳر جهت تولید ﺳﻄﻮح ﻣﻘﺎوم ﭘﺮاﻧﺤﻨﺎ را ﻓﺮاهم ﻣﯽ آورد. ﺑﺘﻦ الیافی از ﻗﺎبلیت ﺟﺬب اﻧﺮژی ﺑﺎﻻﻳﯽ نیز ﺑﺮﺧﻮردار اﺳﺖ و ﺗﺤﺖ اﺛﺮ ﺑﺎرهای ﺿﺮﺑﻪ ای ﺑﻪ راﺣﺘﯽ از هم ﭘﺎشیده ﻧﻤﯽ ﺷﻮد. ﺷﺎهد ﺗﺎرﻳﺨﯽ اﻳﻦ ﻓناوری، ﮐﺎرﺑﺮد کاهگل در ﺑﻨﺎهای ﺳﺎﺧﺘﻤﺎن اﺳﺖ. در واﻗﻊ ﺑﺘﻦ الیافی نوع پیشرفته اﻳﻦ ﺗﮑﻨﻮﻟﻮژی می ﺑﺎﺷﺪ ﮐﻪ الیاف طبیعی و ﻣﺼﻨﻮﻋﯽ ﺟﺪﻳﺪ، ﺟﺎﻧﺸین ﮐﺎه و سیمان جانشین ﮔﻞ ﺑﮑﺎر رﻓﺘﻪ در کاهگل ﺷﺪه اﺳﺖ. اﻟﯿﺎف ﻣﻮرد ﺑﺮرﺳﯽ در اﯾﻦ تحقیق، از نوع اﻟﯿﺎف پلی الفین و ﭘﻠﯽ ﭘﺮوﭘﯿﻠﻦ می باشد. در این تحقیق دلیل ضرورت استفاده از الیاف، نحوه ساخت، خواص مکانیکی، کاربردهای بتن الیافی و به دست آوردن ضرایب تبدیل نمونه های استاندارد مکعبی بتن الیافی با ابعاد متغیر به نمونه ی استاندارد استوانه ای بتن الیافی با توجه به نتایج کاربرد ها و پژوهش های انجام شده مورد بحث و بررسی قرار گرفته است.

کلیدواژه‌ها

عنوان مقاله English

Obtaining conversion coefficients of standard cubic samples of fiber concrete to standard cylindrical sample of fiber concrete

نویسندگان English

Kian Asghari
Mehdi Vajdian
Department of Civil Engineering, Faculty of Engineering, Islamic Azad University of Aligudarz, Aligudarz, Iran
چکیده English

The destruction of concrete depends on the formation of cracks and cracks in the cracks. As the load increases, the cracks are connected together, forming the cracks. In order to overcome this problem as well as the creation of homogeneous conditions, in the last few decades, a series of thin strands used in all the volume of concrete are used, which are called fibers. Fibers concrete is actually a composite that increases the tensile strength by applying the reinforcing fibers inside the concrete mixture. This composite combination has the proper integration and continuity and the possibility of using concrete as a possible material to produce wiggly - resistant surfaces. Fibers concrete is also highly capable of absorbing high energy and is not easily break down under the impact of impact loads. The historical witness of this technology is the great use of building buildings. As a matter of fact, fibers concrete is the advanced form of this technology, which is replaced by natural and synthetic fibres, replacement of straw, and cement replacement in the thatch. The fibers used in this study is of the type of polyolefin fiber and polyolefine. In this research, the reason for the necessity of using fibers, construction method, mechanical propeties and applications of fiber concrete and obtaining conversion coefficients of standard cubic samples of fiber concrete to standard cylindrical sample of fiber concrete according to the results of applications and research has been discussed.

کلیدواژه‌ها English

  • Fiber concrete
  • Polyolefin fiber
  • Polypropylene fiber
  • Mechanical properties
  • Conversion coefficients
[1] Neville, 1999, Properties of Concrete, Family Translation, H., Fourth Review, First Edition, Abu Rihan Biruni
Publications, Tehran.
[2] Babaei, H., 2013, Study of physical and mechanical properties of fiber concrete, Master Thesis, Islamic Azad University
of Yazd.
[3] Vazifehkhah, N., Manafpour, A., 2012, Laboratory study of tensile strength of concrete with polypropylene fibers,
Journal of Civil and Environmental Engineering, Ferdowsi University of Mashhad, Volume 42, Number 4, pp. 47-56.
[4] Khaloo, A., Kazemi, M., 2008, Behavior and Applications of Fiber Concrete, Proceedings of the Fourth National
Congress of Civil Engineering, University of Tehran, pp. 1-30.
[5] Modarresi, M., Rahnama, H., Farahani, A., 2011, The effect of seawater on the properties of concrete with polypropylene
fibers, Sixth National Congress of Civil Engineering, Semnan University, Semnan, Iran.
[6] Building and Housing Research Center, 1999, Journal No. K-283: Concrete technology in the environmental conditions
of the Persian Gulf - Volume I: Concrete pathology and its evaluation, first edition, Tehran, Iran.
[7] Hosseinian, S., Ranjbar, M., Mohammadi, A., Muslimi Hosseini, S., 2014, The effect of polypropylene fibers on the
mechanical properties of self-compacting concretes, Sixth Annual National Iranian Concrete Conference, Tehran, Iranian
Concrete Association.
[8] Singh, A.P & Singh, S.P, 2011, Enhancing structural performance utilizing fibres. Proceedings of the international
UKIERI concrete congress new delhi india 8-10, page no.153-176.
[9] Balaguru, p, 1994, Contribution of fibers to crack reduction of cement composites during the Initial and final setting
period. ACI materials journal,Vol.91,No. 3, page 280-288Iran Institute of Standards and Industrial Research, 2004,
Properties of light aggregates used in concrete blocks, Standard No. 7657, First Edition, pp. 1-14.
[10] Iranian Institute of Standards and Industrial Research, 1999, Properties of Portland Cement, Standard No. 389, Third
Revision, Eighth Edition, Pages 1 to 12.
[11] Sirjan Nano and Yarn, 2018, A Study of Micro and Macrosynthetic Fibers in the Scientific Journal of Concrete
Materials and Structures, Iranian Concrete Scientific Association, Fourth Year, pp. 114-130.
[12] Mostofi Nejad, d, 2017, Laboratory study of the effect of material, geometry and composition of different fibers. Fourth
International Conference on Structural Engineering, Tehran Olympic Hotel.
[13] ASTM 2223, Standard Specification for Concrete Aggregates, Appendix, ASTM C33, Annual Book of ASTM
Standards, Philadelphia, vol. 24-22.
[14] Poor Moghadam, A, Taqdas, H, Mahmoudzadeh, F, Shokrchizadeh, M, 2005, Investigation of fiber distribution and
orientation in fiber reinforced concrete. Journal of the Faculty of Engineering, Volume 39, Number 3, pp. 311-318.
[15] ASTM Standard Test, 2214, Method standard test for compressive strength of cylindrical concrete Specimens, ASTM
C39, Annual Book of ASTM Standards, Philadelphia, vol. 24-21.
[16] ASTM Standard Test, 2211, Standard test method for splitting tensile strength of cylindrical concrete specimens,
ASTM C496, Annual Book of ASTM Standards, Philadelphia, vol. 24-22.
[17] ASTM Standard Test, 2211, Standard test method for determining the apparent chloride diffusion coefficient of
cementitious mixtures by bulk diffusion, ASTM C1556, Annual Book of ASTM Standards, Philadelphia, vol. 24-22.
[18] Iranian Institute of Standards and Industrial Research, 2221, Industrial Sulfuric Acid - Properties and Test Methods,
Standard Number 212, Second Revision, pp. 1- 68.
www.cpjournals.com ISSN:6262-155X )Civil & Project Journal)CPJ(( پروژه و عمران نشریه
غبل دٍم، دٍزُ 2 ،ؾوبزُ 5 ،هسداد 1399،ؾوبزُ پیبپی 15،قفحِ 69 تب قفحِ 86
79
[19] Iranian Institute of Standards and Industrial Research, 2002, Hydrochloric acid-characteristics and test methods,
standard number 209, second revision, first edition, pp. 1-58.
[22] ASTM Standard Test, 2213, Method of test for density, Absorption, and voids in hardened concrete, ASTM C642,
Annual Book of ASTM Standards, Philadelphia, vol. 24-21.
[21] ASTM Standard Test, 2223, Method for resistance of concrete to rapid freezing and thawing, ASTM C666, Annual
Book of ASTM Standards, Philadelphia, vol. 24-22.
[22] ASTM Standard Test, 2222, Method for abrasion resistance of concrete or mortar surfaces by the rotating-cutter
method, ASTM C 944, Annual Book of ASTM Standards, Philadelphia, vol. 24-22.
[23] Office of National Building Regulations, 2213, Ninth Topic of National Building Regulations, Design and Execution
of Reinforced Concrete Buildings, Tehran Press, Iran Development Journal, Page 34.
  • تاریخ دریافت 19 تیر 1399
  • تاریخ بازنگری 20 مرداد 1399
  • تاریخ پذیرش 25 مرداد 1399
  • تاریخ اولین انتشار 25 مرداد 1399
  • تاریخ انتشار 01 مرداد 1399